briefing room after the release of a new e-mail about the infamous talking points. The e-mail was from deputy national security adviser Ben Rhodes. We see it rig there. You really got into it in the briefing room. There's no question. Here's the thing. The white house, what this seems to suggest is that the white house wanted Susan rice to talk so much about the protests triggering the attack in benghazi to deflect criticism from white house policies. But now what has happened is, the bigger issue, why was that e-mail not turned over to congress earlier? That failure to turn over has republicans on capitol hill crying coverup and John Boehner, speaker of the house, doing what he has long resisted doing, creating a special committee to have yet another investigation into benghazi. Eyebrows also raised after the interview of the required general. There are questions of time, space, credibility. Could we have gotten there in time the make a difference? The point is, we should have tried. Brigadier general lovell said despite his wish to get there, they would not have been able to get there in time. That's what official reports have determine as well. This raises again, the critical issue of security. You went behind the scenes so see what more is being done to protect our diplomats. I did. Diplomatic security never wants another benghazi. They gave us special access to see what they're doing in hopes such a tragedy never happens again. Hallway down here. Reporter: In the fictional country of erehwon, that's nowhere spelled backwards. All vehicles down, all vehicles down. Reporter: These diplomatic security agents are H their tenth and final week of hostile environment training. Even though this is an exercise, the memory of benghazi hangs over it all. The training is challenging. Physically and mentally. Agents must prove themselves in 160 essential tasks. From the hard skills like shooting. And driving. To the soft skills, communication. Go for concert. Reporter: Planning and preparing for every possible threat. Guys, we gotta move. Hesitation kills in an attack. And so, their actions need to be crisp. This training brings it all together. Move it! Reporter: Agents must work through stress and fatigue. Solving complex problems with limited resources. There are no shortage of outposts that can turn dangerous, even deadly. Without warning. Cover. Reporter: Last year, a suicide attack at a U.S. Embassy in Turkey. In 2012, a car bomb attack on a convoy in Pakistan. And of course, benghazi. But the mission for U.S. Diplomats must move forward. Secretary Kerry has said repeatedly, America demands that we cannot retreat behind bricks and barbed wire. We have to be out there. Reporter: Back at the consulate, a car bomb. The fake country of erehwon suddenly feels very real. Attackers reached the Gates and storm the compound. The Marines claim the enemy outside continues to attack. The people inside have no idea what is happening next. Wounded agents in need of medical care. We're taking increased idf fire. They're zeroing us in. Copy. Reporter: Enemy mortar fire is getting closer. Stay down. Reporter: Deteriorating security conditions reach a tipping point. Permission to evac? Reporter: The decision is made to abandon the compound. They whisk the consul general, the staff, and injured agents to the landing zone. Ladies and gentlemen, you have just completed a capstone. Reporter: Ten weeks of training come to an end. This may be a training environment. It may be pretend, per Se. This is what we prepare for. We have to prepare for the worst. Reporter: When you were in the consulate, you grabbed those flags. Absolutely. This is a symbol of our country. When it flies over the consulate, it says we're there, we're open for business. If we leave, we take it with us. It's very important to us. They have very important to us. Thank you, Martha Raddatz for that.

This transcript has been automatically generated and may not be 100% accurate.

Retired General Criticizes US Response to Benghazi Attack

Brig. Gen. Robert Lovell testified the U.S. did not do enough in response to the 2012 terrorist attack in Benghazi.

Debate Over Benghazi Attack Flares

Newly released White House emails outline talking points for administration.